What are the next letters in the following pattern? ?

at, cs, fr, jq,

a. pp
b. pn
c. on
d. op

answer is OP

 count the difference in letters between the first letters

 a -c-f-j  c is 2 away from a, f is 3 away from c, etc so the next letter in that pattern would be O

the second letter is going backwards tsrq, so P comes before q

the area of the rectangle is 35units^2.

step-by-step explanation:

graph it and find the distance.

it is a 5*7 rectangle.

therefore the area is 35units^2.

step-by-step explanation:

let pq = qr = rs = x, and xz = y and zu = z.

if the horizontal lines are parallel, then corresponding segments are in proportion:

substitute:

therefore 3 = y = z.

xu = y + z → xu = 3 + 3 = 6